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O.S. .15 max III Empty O.S. .15 max III

Post  JPvelo Mon Oct 27, 2014 8:31 pm

I have a chance to pick this up for $30, can probably get it down to $25.

Strong runner? Worth buying?
O.S. .15 max III Koay34t
O.S. .15 max III AWlybSU
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Post  Cribbs74 Mon Oct 27, 2014 8:43 pm

It's pretty good, I have seen one on a Jr. Ring and it pulled it really well. $20 sounds better. You will have to spend that much to convert it to CL or wire the carb and drop the muffler.

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Post  JPvelo Mon Oct 27, 2014 9:48 pm

I was thinking about leaving the carb and using it on .15 size navy carried plane. I wonder if it has enough giddy up for that.
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Post  Cribbs74 Mon Oct 27, 2014 10:04 pm

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Post  Cribbs74 Mon Oct 27, 2014 10:06 pm

Hey wait that's a Max II you have.

Here is a review for that:

http://sceptreflight.net/Model%20Engine%20Tests/OS%20Max-II%2015.html

Manufactured 1958
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Post  Oldenginerod Tue Oct 28, 2014 2:02 am

I love reading these old reviews.  I mean, where else would you read the word "hitherto" in relation to model engines!!   Smile
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Post  stevej Tue Oct 28, 2014 3:26 am

I was test running a OS MAX II .15 just yesterday. They use non-standard threads on the screws. The one I have vibrates quite a bit. You may get foaming fuel if you use a hard tank.
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Post  Surfer_kris Tue Oct 28, 2014 7:57 am

I guess it would be fine for CL if you remove all the "RC" gadgets. The intake choke was just an early add-on which could reduce the rpm somewhat by choking the engine. You would then have one very rich setting or the regular full throttle setting.

For RC flight, the world has moved on though. With a proper RC carb you don't need the exhaust restrictor etc.
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Post  Surfer_kris Tue Oct 28, 2014 8:00 am

@Cribbs74 wrote:It's pretty good, I have seen one on a Jr. Ring and it pulled it really well. $20 sounds better. You will have to spend that much to convert it to CL or wire the carb and drop the muffler.

The "conversion" will not really cost anything. The engine doesn't have a proper carb, it is only an intake choke which is easily removed and you have the regular CL spray bar still in place.
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Post  gcb Thu Oct 30, 2014 8:52 pm

My first MAX .15 was a MAX-1. I enjoyed it quite a bit.

My MAX-II .15 came with both CL and RC parts. For CL use it came with two venturi inserts. If you run it without an insert you may need to use pressure. I honestly can't remember running it so it may be NIB. I think they only made the MAX-II for a year or so then replaced it with the MAX-III which was a great engine.  

George

Additional thoughts:
As surfer_kris said, the throttle is an early attempt. At that time engine guys were using intake baffles, exhaust baffles, and combinations. The next generation (MAX-III) had a real cab and an exhaust butterfly. Even that carb evolved over the life of the MAX-III.
Due to its short production life, parts may be hard to find.
If you are intending to use it for carrier, you will find the top end will be much less than a modern engine. Perhaps use it for practice?
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